Insider · CIK 0001865116
Sean Patrick Buckley
Files at MGNI (MAGNITE, INC.). First filing Nov 13, 2024, latest Jun 18, 2026.
Sean Patrick Buckley files SEC Form 4 as president at MGNI (MAGNITE, INC.). Since Nov 13, 2024, Sean Patrick Buckley has reported 0 open-market buys worth $0 and 10 open-market sells worth $2.9M, the latest filed on Jun 18, 2026.
A track record needs three past buys with six months of prices behind them; Sean Patrick Buckley has 0, so none is measured yet.
The newest scored trade: sold $365k of MGNI on Jun 17, 2026, filed Jun 18, 2026, scored 25 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 3 sells worth $457k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
MGNI: MAGNITE, INC.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 25Weak | MAGNITE, INC. | $365k 19,233 shares | -5% | +63% from low-31% from high | |
| 20Weak | MAGNITE, INC. | $32k 2,213 shares | -1% | +64% from low-44% from high | |
| 22Weak | MAGNITE, INC. | $59k 4,426 shares | -2% | +49% from low-49% from high | |
| 65Notable | MAGNITE, INC. | $1.0M 40,000 shares | -12% | +182% from low-4% from high | |
| 33Weak | MAGNITE, INC. | $478k 20,201 shares | -6% | +170% from low-1% from high | |
| 26Weak | MAGNITE, INC. | $152k 9,692 shares | -3% | +73% from low-27% from high | |
| 27Weak | MAGNITE, INC. | $201k 10,527 shares | -3% | - | |
| 30Weak | MAGNITE, INC. | $374k 18,693 shares | -4% | - | |
| 21Weak | MAGNITE, INC. | $156k 10,001 shares | -3% | - | |
| 19Weak | MAGNITE, INC. | $79k 5,242 shares | -2% | - |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Sep 9, 2025 | MGNI MAGNITE, INC. | 20,000 0.01% of outstanding | $492k | Sep 9, 2025 | $989k |
| Sep 8, 2025 | MGNI MAGNITE, INC. | 20,000 0.01% of outstanding | $511k | Sep 8, 2025 | $478k |
| Aug 19, 2025 | MGNI MAGNITE, INC. | 9,315 0.01% of outstanding | $218k | Aug 19, 2025 | $260k |
| Aug 15, 2025 | MGNI MAGNITE, INC. | 14,461 0.01% of outstanding | $343k | Aug 18, 2025 | $152k |
| May 16, 2025 | MGNI MAGNITE, INC. | 9,692 0.01% of outstanding | $152k | May 16, 2025 | $201k |
| Feb 19, 2025 | MGNI MAGNITE, INC. | 10,527 0.01% of outstanding | $201k | Feb 19, 2025 | $374k |
| Feb 7, 2025 | MGNI MAGNITE, INC. | 18,693 0.01% of outstanding | $374k | Feb 7, 2025 | $235k |
| Nov 18, 2024 | MGNI MAGNITE, INC. | 10,001 0.01% of outstanding | $156k | Nov 18, 2024 | $147k |
| Nov 12, 2024 | MGNI MAGNITE, INC. | 5,242 0.00% of outstanding | $79k | Nov 11, 2024 | $147k |
Transactions
Every row this insider has filed, 26 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jun 17, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -19,233 | $19.00 | $365k | 373,514 | Jun 18, 2026 |
| May 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -12,019 | $12.82 | $154k | 392,747 | May 19, 2026 |
| Feb 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -26,942 | $11.70 | $315k | 402,999 | Feb 18, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | MOption exercise Common Stock | +64,125 | $0.00 | $0 | 460,310 | Jan 12, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -30,369 | $16.17 | $491k | 429,941 | Jan 12, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | MOption exercise Performance Stock Unitsderivative | -64,125 | $0.00 | $0 | 0 | Jan 12, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +127,273 | $0.00 | $0 | 396,185 | Jan 5, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +42,757 | $0.00 | $0 | 42,757 | Jan 5, 2026 |
| Nov 24, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -2,213 | $14.50 | $32k | 268,912 | Nov 26, 2025 |
| Nov 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock10b5-1 | -11,642 | $14.15 | $165k | 275,551 | Nov 18, 2025 |
| Nov 18, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -4,426 | $13.36 | $59k | 271,125 | Nov 18, 2025 |
| Sep 8, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -20,000 | $25.56 | $511k | 307,193 | Sep 10, 2025 |
| Sep 9, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -20,000 | $24.61 | $492k | 287,193 | Sep 10, 2025 |
| Aug 18, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -10,886 | $23.85 | $260k | 336,508 | Aug 20, 2025 |
| Aug 19, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -9,315 | $23.42 | $218k | 327,193 | Aug 20, 2025 |
| May 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock10b5-1 | -15,049 | $15.88 | $239k | 357,086 | May 16, 2025 |
| May 16, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -9,692 | $15.73 | $152k | 347,394 | May 16, 2025 |
| Feb 19, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -10,527 | $19.13 | $201k | 370,558 | Feb 21, 2025 |
| Feb 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -27,444 | $20.00 | $549k | 381,085 | Feb 19, 2025 |
| Feb 7, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -18,693 | $20.00 | $374k | 408,529 | Feb 7, 2025 |
| Jan 9, 2025 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +123,479 | $0.00 | $0 | 427,222 | Jan 13, 2025 |
| Jan 9, 2025 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +41,566 | $0.00 | $0 | 41,566 | Jan 13, 2025 |
| Nov 15, 2024 | MGNI MAGNITE, INC. | FTax withholding Common Stock10b5-1 | -10,133 | $15.85 | $161k | 313,744 | Nov 19, 2024 |
| Nov 18, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -10,001 | $15.60 | $156k | 303,743 | Nov 19, 2024 |
| Nov 11, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -2,623 | $14.50 | $38k | 326,496 | Nov 13, 2024 |
| Nov 11, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -2,619 | $15.50 | $41k | 323,877 | Nov 13, 2024 |
Questions about Sean Patrick Buckley
Answered from the filings on this page, as of the latest one.
Is Sean Patrick Buckley buying or selling?
In the last 12 months Sean Patrick Buckley reported 0 open-market buys worth $0 and 3 open-market sells worth $457k on SEC Form 4; the latest was sold $365k of MGNI on Jun 17, 2026. Grants, option exercises and tax withholding are not counted.
How did Sean Patrick Buckley's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Sean Patrick Buckley has 0.
Where does Sean Patrick Buckley file Form 4?
Sean Patrick Buckley has filed Form 4 at MGNI (MAGNITE, INC.) as See Remarks. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.